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2005.09.28 09:34 "Re: Additional Lossless Compression Schemes", by Kevin Wheatley
Bob Friesenhahn wrote: > The largest 35mm film scan I have encountered is 16-bit and has the > dimensions 5232x4376. This requires 131MB of disk space. 10X that > is 1.31GB of disk space. the largest images we've scanned on 35mm, where a straight Northlight scan is 6K across the 35mm, is larger than that. The resolution is 6144x4668 on 4 perf and 6144x9336 on 8 perf (which is on its side A.K.A. VistaVision) scanned at 16 bits per channel, 3 channels is about 329MiB per frame... with modern film stocks being better than 6K (which is a 4 micron pixel), I wouldn't put it past somebody to go for an 8K (3 micron) scan across 35mm soon which would then be 8196x6224 and 8196x12448 (583.5 MiB per frame) for 35mm, for obvious reasons I'd only recomend this for stills at the moment! FYI, The layout of film scanners using line arrays is always to move the film with the line array perpendicular to the direction of travel, you only have to move one thing in this arrangement - the film! The Northlight 65mm scanner uses essentially the same CCD system as the 35mm, its just focused over a larger film area so is actually using 'bigger pixels' giving less sampling resolution for the same pixel count, but the grain is also reduced by doing so. Kevin -- | Kevin Wheatley, Cinesite (Europe) Ltd | Nobody thinks this | | Senior Technology | My employer for certain | | And Network Systems Architect | Not even myself |